Talk about taking a quote out of context. Best to just read the whole article, but right after he also says.
“We need to have some humility here,” he added. “We really don’t know what the real number is. I think the real range is somewhere between 70 to 90 percent. But, I’m not going to say 90 percent.”
Herd immunity is also a moving target based on a lot of factors. Hopefully it doesn't reach measles level requirement.